Osmosis Jones

Osmosis Jones - Osmosis Jones Joe Wallace Section 009 A...

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Osmosis Jones Joe Wallace Section 009 A Julie Ryan Karon Felton
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Introduction In this lab, students will have a better understanding of how water and nutrients move across cellular membranes. Using a semi-permeable membrane, starch, glucose, and Lugol’s Solution, students will be able to see the processes of osmosis and diffusion in action. “In the cells of plants and animals, protoplasm is limited or restrained from the environment by the existence of a membrane. These membranes, by necessity, must be relatively permeable to assist in such life processes as respiration and excretion. Membranes must permit some substances to pass through, yet prohibit other substances from doing so. They may allow rapid diffusion of some substances or very slow diffusion of others. Diffusion is the movement of particles from where they are more concentrated to where they are less concentrated. Osmosis specifically refers to the diffusion of water through a membrane from high concentration to low concentration. Membranes can be referred to as differentially permeable, selectively permeable, or semi- permeable” (1). Through the students’ observations of many different substances, they will see some substances that diffuse through a semi-permeable membrane, and some that will not. After the experiment is complete, I believe that all of the substances present will be able to diffuse across the semi-permeable membrane. Food nutrient analysis The six essential nutrients for the body are carbohydrates, lipids, proteins,
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vitamins, minerals, and water. Examples of carbohydrates are sugar and starches, and examples of lipids are fats and oils. The body in order for the body to function normally needs all of these nutrients. Essential nutrients are found in the food we eat. Some of the jobs these nutrients provide for us are growth, maintenance, regulating body processes, and energy. Nutritional scientists use a variety of testing methods to detect what type of foods these essential nutrients can be found in. Some of the tests include the iodine test for starch, the Sudan IV assay for lipids, and the copper sulfate assay for proteins (2). The students in this experiment will use each of these tests mentioned. After using the Starch Testing Solution to test for carbohydrates, I believe that the mixture in test tube A will remain a clear, orange-brown color, while the mixture in test tube B will turn into a black color. Methods First, students will break into separate groups of five or six people. Then, each group will need 1 semi-permeable membrane, 1 600 ml beaker, 1 plastic cup, and 2 Glucose Testing Strips. Second, fill the plastic cup with water 2-4 cm from the top of the cup. Dip one of the Glucose Testing Strips into the water. This will test the water for any presence of glucose before any substances are added. Remove the testing strip and see if there is any change in color. If the testing strip is yellow, this means that no glucose is present. If the testing
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This note was uploaded on 09/09/2011 for the course ENGLISH 132 taught by Professor Staff during the Fall '11 term at UCSB.

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Osmosis Jones - Osmosis Jones Joe Wallace Section 009 A...

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